1# SPDX-License-Identifier: GPL-2.0 2# Copyright (C) 2020 ARM Limited 3 4# preserve CC value from top level Makefile 5ifeq ($(CC),cc) 6CC := $(CROSS_COMPILE)gcc 7endif 8 9CFLAGS += -mbranch-protection=pac-ret 10 11# All supported LLVMs have PAC, test for GCC 12ifeq ($(LLVM),1) 13pauth_cc_support := 1 14else 15# check if the compiler supports ARMv8.3 and branch protection with PAuth 16pauth_cc_support := $(shell if ($(CC) $(CFLAGS) -march=armv8.3-a -E -x c /dev/null -o /dev/null 2>&1) then echo "1"; fi) 17endif 18 19ifeq ($(pauth_cc_support),1) 20TEST_GEN_PROGS := pac 21TEST_GEN_FILES := pac_corruptor.o helper.o 22TEST_GEN_PROGS_EXTENDED := exec_target 23endif 24 25include ../../lib.mk 26 27ifeq ($(pauth_cc_support),1) 28# pac* and aut* instructions are not available on architectures berfore 29# ARMv8.3. Therefore target ARMv8.3 wherever they are used directly 30$(OUTPUT)/pac_corruptor.o: pac_corruptor.S 31 $(CC) -c $^ -o $@ $(CFLAGS) -march=armv8.3-a 32 33$(OUTPUT)/helper.o: helper.c 34 $(CC) -c $^ -o $@ $(CFLAGS) -march=armv8.3-a 35 36# when -mbranch-protection is enabled and the target architecture is ARMv8.3 or 37# greater, gcc emits pac* instructions which are not in HINT NOP space, 38# preventing the tests from occurring at all. Compile for ARMv8.2 so tests can 39# run on earlier targets and print a meaningful error messages 40$(OUTPUT)/exec_target: exec_target.c $(OUTPUT)/helper.o 41 $(CC) $^ -o $@ $(CFLAGS) -march=armv8.2-a 42 43$(OUTPUT)/pac: pac.c $(OUTPUT)/pac_corruptor.o $(OUTPUT)/helper.o 44 $(CC) $^ -o $@ $(CFLAGS) -march=armv8.2-a 45endif 46